They are listed on the daily schedule you get as you go into the parks. Look for the Paradise Pier section, "Operation Playtime!" to get the times they will be there. (Last weekend it was 10:30, 11:30, 12:30, 2:30, 3:30, and 4:15) Usually we see them about where the World of Color holding pens are, between the end of the pier and the new Ariel ride.